Senior Software Developer, LLM Infrastructure

About the role

Build something people love Wealthsimple is Canada’s leading financial innovator. The company offers a full suite of simple, sophisticated financial products across managed investing, do-it-yourself trading, cryptocurrency, tax filing, spending and saving. Wealthsimple currently serves more than 4 million Canadians and holds over $155 billion in assets under administration. The company was founded in 2014 by a team of financial experts and technology entrepreneurs, and is headquartered in Toronto, Canada. We're proud of what we've built — and we're just getting started. Read our Culture Manual and learn more about how we work.

What you'll do

• As a Senior Software Engineer on the ML Infrastructure team, you will design and implement the core backend and infrastructure powering our AI systems. You will work closely with data scientists, platform engineers, and engineering leaders to scale our GenAI footprint efficiently and securely.
• In this role, you will have the opportunity to:
• Build model-routing architecture (e.g., LiteLLM integration) to dynamically direct requests across internal and external models.
• Provision and manage high-performance GPU infrastructure for serving open-source LLMs.
• Build evaluation frameworks (Evals) that enable engineers and data scientists to benchmark model quality against production requirements.
• Drive key cost-optimization and infrastructure efficiency initiatives without sacrificing system accuracy or reliability.